Future architects invited to explore profession, process at OPN Architects Cedar Rapids On Oct. 19, in celebration of World Architecture Day, OPN Architects invites high school students – in grades nine through 12 – to spend the afternoon at the firm’s Cedar Rapids studio, 200 Fifth Ave. SE, from 2:30 to 5 p.m. to get a hands-on look at architecture as a practice and a profession. Learn more about the event on OPN's website or Facebook.